Job Description

We are looking for a Network Administrator to support and maintain critical network infrastructure for a utilities and infrastructure environment in Chino, California. This Long-term Contract position focuses on ensuring secure, reliable connectivity across LAN and Cisco-based network environments while supporting day-to-day administration and troubleshooting. The ideal candidate will bring strong hands-on experience with firewall technologies, Cisco routers, Active Directory, and core networking operations in a fast-paced technical setting.

Responsibilities:

• Administer and support Cisco-based network infrastructure to maintain stable and secure connectivity across the organization.
• Configure, monitor, and troubleshoot firewall platforms to protect network assets and enforce security policies.
• Manage Cisco routers and related network components, resolving performance issues and maintaining optimal uptime.
• Oversee local area network operations, including connectivity, performance monitoring, and issue resolution for end users and systems.
• Support Active Directory-related network access and authentication needs in coordination with broader IT operations.
• Investigate network incidents, identify root causes, and implement corrective actions to reduce recurring disruptions.
• Maintain network documentation, diagrams, and configuration records to support operational consistency and compliance.
• Collaborate with internal teams on infrastructure updates, enhancements, and any network-related transition activities as needed.

Requirements

• Hands-on experience administering enterprise network environments with a focus on Cisco networking technologies.
• Strong working knowledge of firewall technologies, including configuration, monitoring, and troubleshooting.
• Proven ability to support and maintain Cisco routers in a production environment.
• Experience working with Active Directory in relation to network access, authentication, or user support.
• Solid understanding of LAN administration, network protocols, and connectivity troubleshooting.
• Ability to diagnose technical issues methodically and communicate resolutions clearly to stakeholders.
• Experience maintaining accurate technical documentation for network configurations and support activities.